Fluid-pressure and analogous brake systems – Speed-controlled – Specific mu determination
Patent
1996-09-11
1997-09-09
Ballato, Josie
Fluid-pressure and analogous brake systems
Speed-controlled
Specific mu determination
303 3, 701 81, B60L 700, B60T 864
Patent
active
056648502
ABSTRACT:
The present invention is directed to an anti-skid control system for controlling a braking force applied to road wheels including driven wheels of an electrically operated vehicle which has an electrical motor for driving the driven wheels. A hydraulic braking pressure is supplied to each wheel brake cylinder through an actuator. The actuator is controlled by a braking force controller into which output signals of wheel speed sensors are fed. A band-pass filter is provided for passing the wheel speeds of the driven wheels having an oscillation property within a predetermined band of frequencies, out of the wheel speeds detected by the wheel speed sensors. And, a coefficient of friction of a road is estimated to be relatively low when the output of the band-pass filter is in a predetermined range of frequencies. The hydraulic braking pressure in each wheel brake cylinder is controlled by the braking force controller in accordance with the estimated coefficient of friction and in response to the wheel speeds detected by the wheel speed sensors, thereby to control the braking force applied to each road wheel.
REFERENCES:
patent: 4813266 (1989-03-01), Nash
patent: 5171070 (1992-12-01), Okazaki et al.
patent: 5419624 (1995-05-01), Adler et al.
patent: 5443583 (1995-08-01), Sugawara et al.
patent: 5511866 (1996-04-01), Terada et al.
Hamada Toshiaki
Kuno Tetsuya
Terazawa Tadashi
Aisin Seiki Kabushiki Kaisha
Ballato Josie
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